<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>权限管理</el-breadcrumb-item>
         <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <el-row>
                <el-col>
                <el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
                </el-col>
                </el-row>
            <el-table :data="rolelist" border stripe width="300px">
             <!-- 展开列 -->
             <el-table-column type="expand">
               <template slot-scope="scope">
                <el-row :class="['bdbottom', i1===0 ? 'bdtop' : '','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                    <!-- 渲染一级权限 -->
                   <el-col :span="5">
                      <el-tag closable @close="removeRightById(scope.row,item1.id)">
                        {{item1.authName}}
                      </el-tag>
                      <i class="el-icon-caret-right"></i>
                    </el-col>
                    <!-- 渲染二级和三级权限 -->
                    <el-col :span="19">
                        <!-- 通过for循环渲染嵌套二级权限 -->
                       <el-row :class="[i2 === 0 ? '': 'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                         <!-- 二级权限 -->
                         <el-col :span="6">
                            <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">
                                {{item2.authName}}
                            </el-tag>
                            <i class="el-icon-caret-right"></i>
                         </el-col>
                         <!-- 三级权限 -->
                         <el-col :span="18">
                          <el-tag type="warning" closable v-for="item3 in item2.children" :key="item3.id" @close="removeRightById(scope.row,item3.id)">
                              {{item3.authName}}
                          </el-tag>
                         </el-col>
                        </el-row>
                    </el-col>
                </el-row>
               </template>
             </el-table-column>  
             <el-table-column label="#" type="index"></el-table-column>
             <el-table-column prop="roleName" label="角色名称"></el-table-column>
             <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
             <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeRolesById(scope.row.id)">删除</el-button>
                <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
              </template>
             </el-table-column>
           </el-table>
            <!-- 分页区域 -->
      <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange"
      :current-page="queryInfo.pagenum" :page-sizes="[1,2,5,10]" :page-size="queryInfo.pagesize"
      layout="total, sizes, prev, pager, next, jumper" :total="total"> <!-- layout用来指定显示哪些布局结构 -->
    </el-pagination>
        </el-card>
        <!-- 添加用户对话框 -->
        <el-dialog title="添加角色" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
        <!-- 内容主体区 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="70px">
       <el-form-item label="角色名" prop="roleName">
        <el-input v-model="addForm.roleName"></el-input>
       </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
        <el-input v-model="addForm.roleDesc"></el-input>
       </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
       <el-button @click="addDialogVisible = false">取 消</el-button>
       <el-button type="primary" @click="addRoles">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改角色对话框 -->
    <el-dialog title="修改角色" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
     <el-form ref="editFormRef" :model="editForm" :rules="editFormRules" label-width="70px">
       <el-form-item label="角色名称" prop="roleName">
        <el-input v-model="editForm.roleName"></el-input>
       </el-form-item>
       <el-form-item label="角色描述" prop="roleDesc">
        <el-input v-model="editForm.roleDesc"></el-input>
       </el-form-item>
     </el-form>
     <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editRolesInfo" >确 定</el-button>
  </span>
</el-dialog>
        <!-- 分配权限的对话框 -->
        <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
          <!-- 树形控件 -->
          <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all
          :default-checked-keys="defKeys" ref="treeRef"></el-tree>
          <span slot="footer" class="dialog-footer">
           <el-button @click="setRightDialogVisible = false">取 消</el-button>
           <el-button type="primary" @click="allotRights">确 定</el-button>
          </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
   data(){
       return {
         // 获取用户列表的参数对象
            queryInfo: {
            query: '',   //查询参数，搜索关键字
            pagenum: 1,   //当前页码
            pagesize: 2    //每页显示多少条数据
           },
           rolelist: [],
           total: 0,
        //    控制分配权限对话框的显示与隐藏
           setRightDialogVisible : false,
        //    所有权限的数据
        rightslist: [],
        //控住添加角色对话框的显示与隐藏
        addDialogVisible: false,
        //添加角色表单数据
        addForm: {
            roleName: '',
            roleDesc: ''
        },
        // 添加表单的验证规则对象
        addFormRules: {    //添加表单的验证规则对象
               roleName: [
                   {required: true,message: '请输入角色名称',trigger: 'blur'},
                   {min: 3,max: 10,message: '角色名的长度在3-10个字符之间',trigger: 'blur'}
               ],
               roleDesc: [
                   {message: '请输入角色描述',trigger: 'blur'},
                   {min: 0,max: 15,message: '角色描述长度在1-15之间', trigger: 'blur'}
               ]
         },
         //控制修改角色对话框的显示与隐藏
        editDialogVisible: false,
        editForm: {},  //查询到的角色信息对象
         editFormRules: {      //修改角色信息的验证规则对象
               roleName: [
                   {required: true,message: '请输入角色名称',trigger: 'blur'},
                   {min: 3,max: 10,message: '角色名的长度在3-10个字符之间',trigger: 'blur'}
               ],
               roleDesc: [
                   {message: '请输入角色描述',trigger: 'blur'},
                   {min: 0,max: 15,message: '角色描述长度在1-15之间', trigger: 'blur'}
               ]
           },
        // 树形控件的属性绑定对象
        treeProps: {
            label: 'authName',
            children: 'children'
        },
        // 默认选中的节点Id值数组
        defKeys: [],
        // 当前即将分配权限的角色ID.l
        roleId: ''
       }
   },
   created(){
       this.getRolesList()
   },
   methods: {
    //    获取所有角色列表
      async getRolesList(){
        const {data: res} = await this.$http.get("roles")
        if(res.meta.status !== 200){
          return this.$message.error("获取数据失败")
          
        }
        this.rolelist = res.data
        this.total = res.data.length
       },
       // 监听pagesize改变的事件
        handleSizeChange(newSize){
            this.queryInfo.pagesize = newSize
            this.getRolesList()
        },
        // 监听页码值的变化
        handleCurrentChange(newPage){
            this.queryInfo.pagenum = newPage
            this.getRolesList()
        },
        //  监听添加角色对话框关闭事件
         addDialogClosed(){
             this.$refs.addFormRef.resetFields()
         },
        //  点击按钮添加新角色
       addRoles(){
         //预校验
         this.$refs.addFormRef.validate(async valid => { //valid为true或false
          if(!valid)return
          //发起添加角色的请求
          console.log(this.addForm);
          const {data: res} = await this.$http.post('roles',this.addForm)
          if(res.meta.status !== 201){
              this.$message.error('添加角色失败')
          }
          //this.$message.success('添加角色成功！')
          this.addDialogVisible = false  //让添加对话框隐藏
          this.getRolesList()  //重新刷新列表，让页面显示出新添加的角色信息
          })
       },
        //修改角色对话框的显示
       async showEditDialog(id){
          const {data:res} = await this.$http.get("roles/"+id)
          if(res.meta.status !== 200) {
              return this.$message.error("查询角色信息失败")
          }
          this.editForm = res.data
          this.editDialogVisible = true
        },
        //监听修改角色对话框的关闭
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //修改角色信息并提交
        editRolesInfo(){
            this.$refs.editFormRef.validate(async valid => {
              if(!valid)return
              console.log(this.editForm);
              //发起修改用户信息的数据请求
              const {data: res} = await this.$http.put("roles/"+ this.editForm.roleId,{
                roleName: this.editForm.roleName,
                roleDesc: this.editForm.roleDesc
                })
                if(res.meta.status !== 200){
                    return this.$message.error('更新角色信息失败')
                }
                this.editDialogVisible = false  //关闭对话框
                this.getRolesList()    //更新用户列表
                this.$message.success('更新角色信息成功')
            })
        },
    //    根据id删除对应权限
      async removeRightById(role,rightId){
        const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
        }).catch(err => err)
        if(confirmResult !== 'confirm'){
            return this.$message.info("取消了删除")
        }
        const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if(res.meta.status !== 200){
            return this.$message.error("删除权限失败")
        }
        role.children = res.data;
       },
    //    展示分配权限的对话框
    async showSetRightDialog(role){
      this.roleId = role.id
    //   获取所有权限值
    const {data: res}= await this.$http.get('rights/tree')
    if(res.meta.status !== 200){
        return this.$message.error("获取权限失败")
    }
    this.rightslist = res.data
    //递归获取三级节点的id
    this.getLeafKeys(role,this.defKeys)

    this.setRightDialogVisible = true
    },
    // 通过递归的形式获取角色下所有三级权限的id，并保存到数组defKeys中
    getLeafKeys(node,arr){
      // 如果当前节点不包含children属性，则为三级节点
      if(!node.children){
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item,arr))
    },
    // 根据id删除角色信息
    async removeRolesById(id){
         //弹框询问角色是否删除数据,如果用户确认删除则返回字符串confirm,如果取消删除则返回字符串cancel
       const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
                          confirmButtonText: '确定',
                          cancelButtonText: '取消',
                          type: 'warning'
        }).catch(err => err)
        if(confirmResult !== 'confirm'){
            return this.$message.info('已取消删除')
        }else{
           const {data: res} = await this.$http.delete("roles/"+id)
           if(res.meta.status !== 200){
               return this.$message.error('删除角色失败')
           }
           this.$message.success('删除角色成功')
           this.getRolesList()
        }
    },
    // 关闭分配权限对话框
    setRightDialogClosed(){
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights(){
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
      if(res.meta.status !== 200){
       return this.$message.error('分配权限失败！')
      }else{
      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightDialogVisible = false
      }
    }
   }
}
</script>
<style lang="less" scoped>
.bdtop {
   border-top: 1px solid #eee
}
.bdbottom {
    border-bottom: 1px solid #eee
}
.el-tag {
    margin: 7px;
}
.vcenter {
    display: flex;
    align-items: center;
}
</style>